<template>
    <div id="tags-view-container" class="tags-view-container">
        <scroll-pane ref="scrollPane" class="tags-view-wrapper">
            <router-link
                    v-for="tag in visitedViews"
                    ref="tag"
                    :key="tag.path"
                    :class="isActive(tag)?'active':''"
                    :to="{ path: tag.path, query: tag.query, fullPath: tag.fullPath }"
                    tag="span"
                    class="tags-view-item"
                    @click.middle.native="closeSelectedTag(tag)"
                    @contextmenu.prevent.native="openMenu(tag,$event)"
            >
                {{ tag.title }}
                <span v-if="!tag.meta.affix" class="el-icon-close" @click.prevent.stop="closeSelectedTag(tag)"/>
            </router-link>
        </scroll-pane>
        <ul v-show="visible" :style="{left:left+'px',top:top+'px'}" class="contextmenu">
            <!--      <li @click="refreshSelectedTag(selectedTag)">-->
            <!--        刷新-->
            <!--      </li>-->
            <li v-if="!(selectedTag.meta&&selectedTag.meta.affix)" @click="closeSelectedTag(selectedTag)">
                关闭
            </li>
            <li @click="closeOthersTags">
                关闭其他
            </li>
            <li @click="closeAllTags(selectedTag)">
                关闭全部
            </li>
        </ul>
    </div>
</template>

<script>
    import ScrollPane from './ScrollPane'
    import path from 'path'

    export default {
        components: {ScrollPane},
        data() {
            return {
                visible: false,
                top: 0,
                left: 0,
                selectedTag: {},
                affixTags: []
            }
        },
        computed: {
            visitedViews() {
                return this.$store.state.tagsView.visitedViews
            },
            routes() {
                return [{
                    path: '/home',
                    name: 'Home',
                    meta: {affix: true, title: '首页'}
                }]
            }
        },
        watch: {
            $route() {
                this.addTags()
                this.moveToCurrentTag()
            },
            visible(value) {
                if (value) {
                    document.body.addEventListener('click', this.closeMenu)
                } else {
                    document.body.removeEventListener('click', this.closeMenu)
                }
            }
        },
        mounted() {
            this.initTags()
            this.addTags()
        },
        methods: {
            isActive(route) {
                return route.path === this.$route.path
            },
            filterAffixTags(routes, basePath = '/') {
                let tags = []
                routes.forEach(route => {
                    if (route.meta && route.meta.affix) {
                        const tagPath = path.resolve(basePath, route.path)
                        tags.push({
                            fullPath: tagPath,
                            path: tagPath,
                            name: route.name,
                            meta: {...route.meta}
                        })
                    }
                    if (route.children) {
                        const tempTags = this.filterAffixTags(route.children, route.path)
                        if (tempTags.length >= 1) {
                            tags = [...tags, ...tempTags]
                        }
                    }
                })
                return tags
            },
            initTags() {
                const affixTags = this.affixTags = this.filterAffixTags(this.routes)
                for (const tag of affixTags) {
                    if (tag.name) {
                        this.$store.dispatch('tagsView/addVisitedView', tag)
                    }
                }
            },
            addTags() {
                const {name} = this.$route
                if (name) {
                    this.$store.dispatch('tagsView/addView', this.$route)
                }
                return false
            },
            moveToCurrentTag() {
                const tags = this.$refs.tag
                this.$nextTick(() => {
                    for (const tag of tags) {
                        if (tag.to.path === this.$route.path) {
                            this.$refs.scrollPane.moveToTarget(tag)
                            if (tag.to.fullPath !== this.$route.fullPath) {
                                this.$store.dispatch('tagsView/updateVisitedView', this.$route)
                            }
                            break
                        }
                    }
                })
            },
            refreshSelectedTag(view) {
                this.$store.dispatch('tagsView/delCachedView', view).then(() => {
                    const {fullPath} = view
                    this.$nextTick(() => {
                        this.$router.replace({
                            path: '/redirect' + fullPath
                        })
                    })
                })
            },
            closeSelectedTag(view) {
                this.$store.dispatch('tagsView/delView', view).then(({visitedViews}) => {
                    if (this.isActive(view)) {
                        this.toLastView(visitedViews, view)
                    }
                })
            },
            closeOthersTags() {
                this.$router.push(this.selectedTag)
                this.$store.dispatch('tagsView/delOthersViews', this.selectedTag).then(() => {
                    this.moveToCurrentTag()
                })
            },
            closeAllTags(view) {
                this.$store.dispatch('tagsView/delAllViews').then(({visitedViews}) => {
                    if (this.affixTags.some(tag => tag.path === view.path)) {
                        return
                    }
                    this.toLastView(visitedViews, view)
                })
            },
            toLastView(visitedViews, view) {
                const latestView = visitedViews.slice(-1)[0]
                if (latestView) {
                    this.$router.push(latestView)
                } else {
                    // if (view.name === 'Dashboard') {
                    //   // to reload home page
                    //   this.$router.replace({path: '/redirect' + view.fullPath})
                    // } else {
                    this.$router.push('/')
                    // }
                }
            },
            openMenu(tag, e) {
                const menuMinWidth = 200
                const offsetLeft = this.$el.getBoundingClientRect().left
                const offsetWidth = this.$el.offsetWidth
                const maxLeft = offsetWidth - menuMinWidth
                const left = e.clientX - offsetLeft

                if (left > maxLeft) {
                    this.left = maxLeft
                } else {
                    this.left = left
                }

                this.top = e.clientY - 60
                this.visible = true
                this.selectedTag = tag
            },
            closeMenu() {
                this.visible = false
            }
        }
    }
</script>

<style lang="scss" scoped>
    .tags-view-container {
        height: 34px;
        width: 100%;
        background: #fff;
        /*border-bottom: 1px solid #d8dce5;*/
        box-shadow: 0 1px 3px 0 rgba(0, 0, 0, .12), 0 0 3px 0 rgba(0, 0, 0, .04);

        .tags-view-wrapper {
            .tags-view-item {
                display: inline-block;
                position: relative;
                cursor: pointer;
                height: 26px;
                line-height: 26px;
                /*border: 1px solid #d8dce5;*/
                color: #7495d9;
                /*未被选中*/
                background: #12306b;
                padding: 0 8px;
                font-size: 12px;
                margin-left: 5px;
                margin-top: 4px;
                color: #88a4df;

                &:first-of-type {
                    margin-left: 15px;
                }

                &:last-of-type {
                    margin-right: 15px;
                }

                &.active {
                    /*當前菜單*/
                    background-color: #3c61ab;
                    color: #fff;
                    border-color: #071C44;

                    &::before {
                        content: '';
                        /*小圆钮*/
                        background: #fff;
                        display: inline-block;
                        width: 8px;
                        height: 8px;
                        border-radius: 50%;
                        position: relative;
                        margin-right: 2px;
                    }
                }
            }
        }

        .contextmenu {
            margin: 0;
            background: #707A8E;
            z-index: 3000;
            position: absolute;
            list-style-type: none;
            padding: 5px 0;
            border-radius: 4px;
            font-size: 12px;
            font-weight: 400;
            color: #333;
            box-shadow: 2px 2px 3px 0 rgba(0, 0, 0, .3);

            li {
                margin: 0;
                padding: 7px 16px;
                cursor: pointer;

                &:hover {
                    background: #eee;
                }
            }
        }
    }
</style>

<style lang="scss">
    //reset element css of el-icon-close
    .tags-view-wrapper {
        .tags-view-item {
            .el-icon-close {
                width: 16px;
                height: 16px;
                vertical-align: 2px;
                border-radius: 50%;
                text-align: center;
                transition: all .3s cubic-bezier(.645, .045, .355, 1);
                transform-origin: 100% 50%;

                &:before {
                    transform: scale(.6);
                    display: inline-block;
                    vertical-align: -3px;
                }

                &:hover {
                    /*××*/
                    background-color: #b4bccc;
                    color: #fff;
                }
            }
        }
    }
</style>
